KINEMATICS OF THE CONNECTING ROD-CRANK MECHANISM

Abstract

The purpose of this work is to determine and analyze the laws of motion (velocities and accelerations) of the components of the cutting mechanisms in order to evaluate and optimize their performance, precision and durability. The present work aims to carry out a detailed kinematic study of the connecting rod-crank mechanism, having as its main objective the determination of the position, velocity and acceleration equations for the translation element (piston) as a function of the geometric parameters (length of the connecting rod and crank) and the angular velocity.
The results obtained will serve as a basis for the analysis of the performances and for the formulation of constructive optimization proposals in specific applications, such as agricultural machinery. From the analysis of the kinematic parameters of the connecting rod-crank mechanism, the following can be formulated:
The kinematic parameters show that in the case of agricultural machinery (mowers), the obtained speed profile allows the choice of an optimal operating regime, ensuring a sufficiently high cutting speed at the moment of impact with the plant, while minimizing excessive dynamic loads when reversing the movement.